Re: Additional information wanted on two Apple ][ cards

["Apple2Steward" <none@none.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
1238610892356551973.946075mjmahon-aol.com@news.giganews.com">news:1238610892356551973.946075mjmahon-aol.com@news.giganews.com...
> Kevin Dady <kevin@hackaday.com> wrote:
>>> er i mean 1.2mb no 1.2gb (i'd like to find a 1981 device that 
>>> did that?
>>
>> look at 12 inch hard disks, they done it
>
> In 1981, the only head-disk assembly (what we now call a drive) 
> with more
> than 1GB of capacity was in the IBM 3380.  It contained two 
> HDAs, each with
> a 1.2GB capacity and it weighed over two tons!
>
> I don't recall the platter size, but each HDA had eight 
> platters. I'd guess
> they were 16" to 18" in diameter.
>
> -michael - NadaNet 3.1 and AppleCrate II: 
> http://home.comcast.net/~mjmahon


14"

http://130.203.133.150/viewdoc/download?doi=10.1.1.50.5494&rep=rep1&type=pdf

See Table 2